Shocking ~ Peeping tom in my block.

Just this morning, I saw a peeping tom peeping in my room.
OMG!
I was just walking into my room after my toilet break when I saw my room window opened and someone had shut it suddenly... Someone is outside, I think... I was thinking, was it my mum? But the door was not opened... I was starled for a moment. Suddenly the guy tried to open my window one more time. Now i realised the situation! I quickly ran to the window, open it and shouted at him. He quickly turned and ran off... I only able to see his back.
A guy.
wearing white shirt.
light yellow short.
short hair.

I believe he live nearby and definitly not the first time.
I'm prepared and will catch him... I'm not going to let him off...
Need your help.
If you have any lobang on surveillance camera, pls tell me.

Thanks.